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February 19-20 Major Winter Storm Threat


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1 minute ago, NorthHillsWx said:

The IMBY takes will always be a part of tracking but I’ll sum up 0z so far:

Positive: triangle 

Negative: everyone else 

Not negative for NENC and Hampton Roads but mostly everywhere else yes. 

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25 minutes ago, wncsnow said:

Congrats Tidewater

sn10_acc-imp.us_ma (26).png

 The 7.6” of RDU “snow” on this Pivotal snow map is way off. Pivotal UK snow maps are typically way overdone on the S side due to counting all wintry as snow.

  RDU gets a lot of qpf (1.0”) but it is mainly from sleet as ~0.75” falls with 850s +1 to +2. There’s ~0.2” falling as ZR when 850s/925s warm above that. There’s ~0.05” falling as snow. So, 0.75” qpf as sleet is ~2.25” of sleet. Add 0.5” of snow to get 2.75” of an overall dense accumulation….it wouldn’t go anywhere fast! It would have the staying power of 7.6” or more of snow. I had that much sleet here in Jan. It was awesome!

@wncsnow knows about the problems with Pivotal UK snow maps

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UK comparison of 0Z vs 12Z at RDU:

12Z UK RDU qpf 1.5”. Of this ~0.1” is snow, ~0.1” is sleet, ~1.1” is ZR (ouch), and 0.2” is rain.

0Z UK is colder than 12Z. RDU qpf 1.0”. Of this, ~0.05” is snow, ~0.75” is sleet, and ~0.2” is ZR. So, much more sleet and way less ZR due to colder aloft.

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1 hour ago, NorthHillsWx said:

Man the GFS is fast with the storm. It’s over before it really begins. Still big differences between it and other guidance 

It seems to always be playing catch-up. For us in the triad QPF is the big question now as it seems more likely than not we will get mostly snow (although never count out the warm nose.). Usually the Euro over does it, so I'm guessing .5-1"

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